1) my car idels extremly ruff when braking, i just had my ECU flashed by speed tuning, i called them and the recommended re-setting the throttle body possition (by putting the car in the on possition for five min) i did and it still sputters, i have been told it may be the vacuum line at the break booster, but i inspected it (along with all the visible lines) and none of them seem to be hissing or disconected
any thoughts?
2) my oil light comes on during low idel, and goes off after acceleration, i think it is just sludge and i going to seafoam it tomarrow
3) my HUD flashes for no reason, just flashes no beeps(unless the above is happening) any thoughts?

The Car
99.5 A4 1.8t Tip AWD
104k
any help would be greatly appreciated

 

Test for boost leaks!

 

Also try cleaning the throttle body.